Answer:
C
Step-by-step explanation:
When free trade is arranged between countries, countries can obtain goods and servicies from other countries. Exchange would tipically happend when prices of certain goods and services are cheaper in other countries than inside our country.
In terms of servicies, companies can find a benefit employing workers in other countries where salaries are lower abroad (for example, companies related to online services may find benecial to employ people with lower salaries in another country, than employing people in their own country where salaries are higher).
This is a cost associated with free trade, because when production is moved to another country, unemployment may rise, and salaries too, decreasing society's wealfare.